Rotary blower or pump



y 1930. w. w. MEYER ROTARY BLOWER OR PUMP 2 Sheets-Sheet 1 Filed March 7, 1928 July 1, 1930.

w. w. MEYER 1,769,153

ROTARY BLOWER OR PUMP Filed March '7, 1928 '3 as a 2 In yenfor-J 2 Sheets-Sheet 2 Patented July 1, 1930 UNITED STATES WILLIAM WARREN MEYER, OF CHICAGO, ILLINOIS ROTARY Browns on PUMP Application filed March 7, 1928. Serial No. asaea.

' My invention relates to rotary air blowers, gas pressure pumps or vacuum pumps,.land in its general aspects aims to accomplish these objects:

(1) To provide simple and effective means .for mufiling and substantially eliminating the-usual noise of such device.

(2) To'provide simple means for eliminating the pulsations of the pumped air or othcr gas, which pulsating is due to the time intervals between the intermittent connec tions of the mechanism to the inlet and exhaust ducts.

(3) To filter the air or other gas before it reaches the-operating mechanism, thereby cleaning the emitted air or gas and also reducing the wear on the mechanism.

' (4) To provide a simple and inexpensive housing? and shaft-supporting means for a p blower or pump embodying the above mentioned features. v

- (5) To provide a housing'also arranged so as to prevent tampering with means for relieving an excess of pressure, and constructed so as to afford ready access to the pumping mechanism without a general disassembling of the blowing or pumping device.

Still further and also more detailed objects will appear from the following specification and from the accompanying drawings,

in which Fig. 1 is a perspective view of a rotary blower or pump embodying my invention. Fig. 2 is an enlarged transverse vertical section, taken along theline 2-2 of Fig. 3. Fig. 3 is a similarly enlargedvertical and longitudinal section, taken along the line 33 of Fig. 2.

Fig. 4 is a transverse section taken through the blower or pumping chamber along the line 4-4 of Fig. 3. 1 Fig.5 is a fragmentary central, vertical and longitudinal section, taken along the line 5-5 of Fig. 4. i .45

In the illustrated embodiment, I am 'showing a'blower including intermeshing impellers 1 and 2 respectively fastened to shafts 3 and 4. Each of these shafts has a gear 5 fast upon it, and the gears 'intermesh with each other, so that the single driven shaft 3 simultaneously rotates the two impellers in opposite directions, the impellers being lobular in shape and designed to intermesh along a pitch line 6 (Fig. 4).

To supportthis mechanism, I provide athree-part housing, including a central casing I integral with a base 44 and having two parallel vertical walls 45 connected intermediate of their heights by horizontal tubes 46, each of which tubes houses two spaced bearings 7 and 9 for one of the shafts. The tubes 46 are connected to each other and to the opposite side walls 47 of the central casing by a horizontal partition 48 which extends to both of the end walls 45. The upper portions of the side walls 47 desirably curve into a top 49 which arches considerably above the horizontal partition 48 and which has an outlet duct 43 leading from its top, while one of the sides 47 has an aperture 50 alining with an inlet duct 35.

The gears 5 are housed by a cup-shaped gearing casing 20 which desirably has flanges 20A bolted to the adjacent end wall 45 of the central casing. To house the impellers, I

preferably provide a cup-shaped impeller housing consisting of a tubular portion 22 having arcuate side parts respectively concentric with the two shafts 3 and 4 (as shown in Fig. 4) and having a flange 22A bolted to the adjacent casing end 45, together with a housing end 23. This housing end preferably has two outwardly directed bosses 23A, each of which houses an outboard bearing 50 for oneof the shafts.

The main casing end 45 adjacent to the impellers has .two ports respectively above and below the: horizontal partition 48, namely an inlet port itfi'leading' from the inlet chamber 39 be ow the partitmn to the interior of the impeller housing, and an outlet port 41 connecting that housing with the compression chamber 42 above the partition. Instead of having the inlet duct 35 open directly to the inlet chamber 39, I interpose a mufiier which desirably is constructed so thatit also acts as a filter for the intake air or gas. For this purpose, the drawings show a flanged tube 30 extending into the inlet (or low pressure) chamber 39 and fitted to the inlet tube 35, a pair of screens 36 and 38'stretched across longitudinally spaced portions of the tube 30, and a filling 37 (of cotton, steel wool and the like in the tube between these screens).

lVith my blower thus constructed, the air drawn through the inlet tube 35 is filtered through the filling 37 which extracts dirt and other impurities from the air, so that such impurities will not be rubbed between the impellers to cause undue wear on the latter. During the rotation of the two impellers, air is drawn through the inlet port and is forced through the outlet port 41 into the compression chamber 42 in periodic impulses. How ever, the relatively large capacity of this compression chamber in proportion to the amount of air forced into it during each pulsation and in proportion to the area of the outlet duct 43 causes the pressure in the compression chamber to equalize, so that air is forced through the outlet duct in a substantially steady stream, instead of being fed in decided puffs. The large interior capacity of the intake chamber 39 also permits this to be filled between the times when the inlet port 40 is wide open. thereby steadying the intake flow through this port into .the impeller chamber. Owing to these'pressure equalizations in the two chambers and to the mufiiing effect of the filtering packing 37, I secure a steadied and noiseless action, in striking contrast to the pulsating and noisy operation of the rotary blowers now in common use.

I also provide the partition 48 with an aperture 51 affording a direct connection between the inlet chamber 39 and the discharge (or pressure-equalizing) chamber 42. This aperture is preferably in alinement with the discharge duct 43 and is controlled by a relief valve 25 arranged so that it will open whenever the pressure in the discharge chamber exceeds that in the inlet chamber to a predetermined extent.

Heretofore, such relief valves have com monly been open to the outer air and have been disposed so that the user could readily modify the adjustment from outside the easing of the blower, thereby often tempting the user to adjust the relief valve to such a high actuating pressure as to cause an overloading of the appliance. With my arrangement, this valve is entirely encased, so that the user of the blower is neither tempted to tamper with its adjustment nor able to do this without taking the blower apart.

By placing the relief valve in alinement with the discharge duct 43, the opening in the casing top 49 aflords the needed access for boring out the aperture 51in the partition and fitting the relief valve to this, while the opening 50 in one side of the casing affords access for inserting the plunger of the valve. Consequently, I can readily make the entire main casing port-ion, including the partition 48 and the journaling tubes 46 of a single and rigid casting, to which the impeller housing 23 and the gear housing 20 are bolted after all other parts of the blower are assembled. This construction also permits ready access to the gears and-impellers by merely detaching the corresponding housings without disassembling any operative parts of the mechanism, so that my arrangement reduces the cost of manufacture as well as the operating expense.

However, I do not wishto be limited to the details of construction and arrangement here illustrated and described, since many changes might be made without departing either from the spirit of my invention or from the ap pended claims. Neither do I wish to be 1 1mited to the employment of my invention 1n a blower.

I claim as my invention i 1. In a blower or the like, a box-like main casing having two vertically spaced-ports at one end thereof, a partition extending between the said ports across the casing to divide the interior of the casing into two chambers, one of the chambers having an inlet port and the other thereof having a discharge port, two shafts extending through the casing, two intermeshing impellers respectively fast on the two shafts and disposed adjacent to the outer face of the casing wall which has the said ports, and a cup-like housing detachably mounted on the last named wall and coopcrating with that wall to house the impellers.

2. A blower or the like as per claim 1, including two j ournaling means carried by the partition and respectively j ournaling the two shafts, the cup-like housing having on its outer wall two cup-like outwardly directed ex tensions, and two outboard bearings respectively housed by the said extensions and each in journaling relation to one of the shafts.

3. In a blower or the like, a single piece box-like housing having-parallel endwalls, a partition integral with the housing and extending longitudinally of the housing from one end wall to the other, the partition having two parallel longitudinal bores opening through both end walls and spaced transversely of the said bores; a cup-shaped impeller casing detachably secured to and having its mouth end engaging one of the said end walls, the said casing having on its endward wall two cup-like formations respectively alining with the said bores; journals respectively mounted in the said bores and the said cup-like formations, and shafts each journaled jointly in journals respectively mounted in one of the said bores and one of the cup-like formations on the impeller casmg.

4. A blower or the like as per claim 3, including two ports formed inthe end wall engaged by the impeller casing at respectively opposite sides of the partition, and coacting impellers respectively fast on the two shafts, the partition having an aperture between the two bores; anda relief valve mounted on the partition and controlling the aperture.

Signed at Chicago, Illinois, March 1, 1928.

WILLIAM WARREN MEYER. 

